ipv6: Add __in6_dev_get_rtnl_net().

We will convert rtnl_lock() with rtnl_net_lock(), and we want to
convert __in6_dev_get() too.

__in6_dev_get() uses rcu_dereference_rtnl(), but as written in its
comment, rtnl_dereference() or rcu_dereference() is preferable.

Let's add __in6_dev_get_rtnl_net() that uses rtnl_net_dereference().

We can add the RCU version helper later if needed.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250115080608.28127-2-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index f8f91b2038eafd645d1b8d28c6515ea4a670fa6c..9e5e95988b9e5dea7be60b75829830f607b9ce0d 100644 (file)
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -347,6 +347,11 @@ static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
        return rcu_dereference_rtnl(dev->ip6_ptr);
 }
 
+static inline struct inet6_dev *__in6_dev_get_rtnl_net(const struct net_device *dev)
+{
+       return rtnl_net_dereference(dev_net(dev), dev->ip6_ptr);
+}
+
 /**
  * __in6_dev_stats_get - get inet6_dev pointer for stats
  * @dev: network device